The vast majority of the collection has been catalogued under call number M.

Related Materials:
See also "Magic Lantern and Slides" (vtls 315650) which includes glass slides of various photographers with at least one Mason slide of the Headfort Demesne as well as Lawrence evictions.

Related Materials:
Individual items have been indentified by Arkhive Productions.

Between 1880 and 1964, Thomas H. Mason, and later Thomas H. Mason & Sons Ltd., operated at 5-6 Dame St., Dublin, as opticians and photographic dealers. The slides in this collection were used to educate audiences as to places and people in Ireland's history.